The fully automated analyzer Celltrak 11 (NOVA biomedical) developed for measurements of hematological parameters in man was tested with the blood samples of 9 species and methods of reference for the applicability in veterinary medicine. Considering the results of own determined species-specific thresholds of different blood cells the ability for the determination of the numbers of erythrocytes and leukocytes, of the hematokrit, of the Hb-concentration and of other parameters of the blood in horse, cattle, sheep, pig, dog, cat, rabbit and rats is demonstrated.